Terrell and Gaye's first major hit was the Nick Ashford and Valerie Simpson composition, "Ain't No Mountain High Enough". The duo quickly followed up with the top five hit ballad, "Your Precious Love". Despite rumors of a romantic relationship – Gaye was married to Anna Gordy and Terrell was dating Temptations lead vocalist David Ruffin – both singers denied such a relationship with Gaye saying later that they had a brother-and-sister relationship, a statement reiterated by Ashford & Simpson. Other hit sing...